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[Qemu-devel] [PATCH v4 07/20] hbitmap: add hbitmap_merge
From: |
John Snow |
Subject: |
[Qemu-devel] [PATCH v4 07/20] hbitmap: add hbitmap_merge |
Date: |
Fri, 20 Mar 2015 15:16:50 -0400 |
We add a bitmap merge operation to assist in error cases
where we wish to combine two bitmaps together.
This is algorithmically O(bits) provided HBITMAP_LEVELS remains
constant. For a full bitmap on a 64bit machine:
sum(bits/64^k, k, 0, HBITMAP_LEVELS) ~= 1.01587 * bits
We may be able to improve running speed for particularly sparse
bitmaps by using iterators, but the running time for dense maps
will be worse.
We present the simpler solution first, and we can refine it later
if needed.
Signed-off-by: John Snow <address@hidden>
Reviewed-by: Max Reitz <address@hidden>
---
include/qemu/hbitmap.h | 11 +++++++++++
util/hbitmap.c | 29 +++++++++++++++++++++++++++++
2 files changed, 40 insertions(+)
diff --git a/include/qemu/hbitmap.h b/include/qemu/hbitmap.h
index 550d7ce..c19c1cb 100644
--- a/include/qemu/hbitmap.h
+++ b/include/qemu/hbitmap.h
@@ -65,6 +65,17 @@ struct HBitmapIter {
HBitmap *hbitmap_alloc(uint64_t size, int granularity);
/**
+ * hbitmap_merge:
+ * @a: The bitmap to store the result in.
+ * @b: The bitmap to merge into @a.
+ *
+ * Merge two bitmaps together.
+ * A := A (BITOR) B.
+ * B is left unmodified.
+ */
+bool hbitmap_merge(HBitmap *a, const HBitmap *b);
+
+/**
* hbitmap_empty:
* @hb: HBitmap to operate on.
*
diff --git a/util/hbitmap.c b/util/hbitmap.c
index 5b78613..ba11fd3 100644
--- a/util/hbitmap.c
+++ b/util/hbitmap.c
@@ -399,3 +399,32 @@ HBitmap *hbitmap_alloc(uint64_t size, int granularity)
hb->levels[0][0] |= 1UL << (BITS_PER_LONG - 1);
return hb;
}
+
+/**
+ * Given HBitmaps A and B, let A := A (BITOR) B.
+ * Bitmap B will not be modified.
+ */
+bool hbitmap_merge(HBitmap *a, const HBitmap *b)
+{
+ int i, j;
+
+ if ((a->size != b->size) || (a->granularity != b->granularity)) {
+ return false;
+ }
+
+ if (hbitmap_count(b) == 0) {
+ return true;
+ }
+
+ /* This merge is O(size), as BITS_PER_LONG and HBITMAP_LEVELS are constant.
+ * It may be possible to improve running times for sparsely populated maps
+ * by using hbitmap_iter_next, but this is suboptimal for dense maps.
+ */
+ for (i = HBITMAP_LEVELS - 1; i >= 0; i--) {
+ for (j = 0; j < a->sizes[i]; j++) {
+ a->levels[i][j] |= b->levels[i][j];
+ }
+ }
+
+ return true;
+}
--
2.1.0
- [Qemu-devel] [PATCH v4 00/20] block: transactionless incremental backup series, John Snow, 2015/03/20
- [Qemu-devel] [PATCH v4 06/20] hbitmap: cache array lengths, John Snow, 2015/03/20
- [Qemu-devel] [PATCH v4 03/20] qmp: Ensure consistent granularity type, John Snow, 2015/03/20
- [Qemu-devel] [PATCH v4 08/20] block: Add bitmap disabled status, John Snow, 2015/03/20
- [Qemu-devel] [PATCH v4 05/20] block: Introduce bdrv_dirty_bitmap_granularity(), John Snow, 2015/03/20
- [Qemu-devel] [PATCH v4 01/20] docs: incremental backup documentation, John Snow, 2015/03/20
- [Qemu-devel] [PATCH v4 04/20] qmp: Add block-dirty-bitmap-add and block-dirty-bitmap-remove, John Snow, 2015/03/20
- [Qemu-devel] [PATCH v4 07/20] hbitmap: add hbitmap_merge,
John Snow <=
- [Qemu-devel] [PATCH v4 15/20] block: Resize bitmaps on bdrv_truncate, John Snow, 2015/03/20
- [Qemu-devel] [PATCH v4 02/20] qapi: Add optional field "name" to block dirty bitmap, John Snow, 2015/03/20
- [Qemu-devel] [PATCH v4 10/20] qmp: Add support of "dirty-bitmap" sync mode for drive-backup, John Snow, 2015/03/20
- [Qemu-devel] [PATCH v4 09/20] block: Add bitmap successors, John Snow, 2015/03/20
- [Qemu-devel] [PATCH v4 13/20] block: add BdrvDirtyBitmap documentation, John Snow, 2015/03/20
- [Qemu-devel] [PATCH v4 18/20] iotests: add QMP event waiting queue, John Snow, 2015/03/20
- [Qemu-devel] [PATCH v4 17/20] iotests: add invalid input incremental backup tests, John Snow, 2015/03/20
- [Qemu-devel] [PATCH v4 11/20] qmp: add block-dirty-bitmap-clear, John Snow, 2015/03/20
- [Qemu-devel] [PATCH v4 19/20] iotests: add simple incremental backup case, John Snow, 2015/03/20